JPH06135277A - Device for reversing and supporting vehicle seat - Google Patents

Abstract

PURPOSE:To enable the posture of a seat to be changed and to prevent the same from floating up only by inserting and removing a lock member, by providing a limiting member for limiting upward rotation of a parallel link mechanism, to a support shaft, and by providing a linking means for operating the limiting member in association with the insertion and removal of the lock member, between the limiting member and the lock member. CONSTITUTION:A support bed 15 is coupled to a stationary bed through the intermediary of a pair of front and rear parallel links 11F, 11R, and a swivel bed 18 is set on the support bed 15 through the intermediary of a vertical shaft 19. Further, a seat is attached on the swivel bed 18, and a lock member 31 is adapted to be inserted between the swivel bed 8 and the support bed 15 so as to set the swivel bed 18 and the support bed 15 so as to set the position of the swivel bed 18 in order to direct the same in a forward or rearward direction. Further, a limiting member 33 which is adapted to be engaged with the parallel links 11F, 11R so as to be rotated upward, is provided to one of support shafts 17F, and a linking means 33 for engaging the limiting member 33 with the parallel links 11F, 11R in association with the insertion of the lock member 31 is provided between the lock member 31 and the limiting member 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat reversing support device used in, for example, a tractor loader backhoe (TLB).

[0002]

2. Description of the Related Art According to a conventional TLB, therefore, a seat on which a driver is seated is fixed to the vehicle body in order to change the seat between a forward posture for tractor traveling and loader work and a rearward posture for backhoe work. One end of each of a pair of front and rear parallel links is pivotally supported on a fixed base via a horizontal axis, a support base is connected to each other end of the front and rear parallel links via a support shaft, and the support base is swung via a vertical axis. A table is rotatably mounted, a seat is mounted on the table, and a biasing means for biasing the other end of the parallel link upward is provided between the fixed side and the parallel link.

In this seat, it is necessary to prevent rotation and limit the height in each posture, and a lock pin can be moved up and down by an operation lever supported on the support base, and the lock pin can be rotated with the support base. By passing through the stand, the swivel stand is prevented from rotating, and a hook that is swung by the operating rod is pivotally supported on the support stand, and this hook is freely engageable with the parallel link or the engaging part provided on the fixed stand. By doing so, the height of the swivel base is limited to prevent the seat from rising.

[0004]

In the above-mentioned prior art, the mechanism for preventing the seat rotation and the height limitation must be performed by separate mechanisms, resulting in a complicated structure and high cost. Since it is located on the lower side and is a protrusion, the device mounting position may be limited. In addition, it is difficult to adjust the height of the seat when it is facing backward.

A first object of the present invention is to provide a restricting member for restricting upward rotation of a parallel link on a support shaft so as to be movable in the axial direction, and to lock the restricting member and the swivel base forward and backward. To provide an inversion support device for a vehicle seat, in which interlocking means for actuating a regulating member by inserting a lock member is provided between the member and the member so that the posture of the seat can be changed and lifting can be prevented at the same time only by inserting and removing the lock member. Is.

A second object of the present invention is to make it possible to adjust the height of the seat in a rearward posture by providing a receiving member for restricting the rearward rotation of the rear parallel link above a certain level so that the vertical position can be adjusted. An object of the present invention is to provide a reversing support device for a vehicle seat.

[0007]

A first concrete means for solving the problems in the present invention is a pair of front and rear parallel links 11F via a horizontal shaft 22 on a fixed base 14 fixed to the vehicle body 1 side.
11R pivotally supports one end of each of the front and rear parallel links 11F, 11
A support base 15 is connected to each other end of R via a support shaft 17,
A swivel base 18 is rotatably mounted on the support base 15 via a vertical axis 19, the seat 4 is mounted on the swivel base 18, and the swivel base 18 and the support base 15 are inserted so that the swivel base 18 faces forward. In the inversion support structure of the vehicle seat, the lock member 31 for locating the rear side and the rear side is provided, and the biasing means for biasing the other end of the parallel link 11 upward is provided between the fixed side and the parallel link 11. A restricting member 33 is provided on one of the front and rear support shafts 17 to engage with the parallel link 11 by axial movement to restrict the upward rotation thereof, and the lock member 31 and the restricting member 3 are provided.
The interlocking means 34 for engaging the regulating member 33 with the parallel link 11 by inserting the lock member 31 is provided between the interlocking member 34 and the parallel link 11.

The second concrete means for solving the problems in the present invention, in addition to the first concrete means, regulates the rearward rotation of the rear parallel link 11R beyond a certain degree at the rear portion of the fixed base 14. That is, the receiving member 40 is provided so that its vertical position can be adjusted.

[0009]

When the seat 4 is in the forward-facing posture A, the rear horizontal axis 2
The arm 25 of the rear parallel link 11R projecting downward from 2R is biased forward by the tension spring 16 locked to the front horizontal shaft 22F for the front parallel link 11F, and biases the parallel link 11 upward. , Play a suspension effect.

When the seat 4 is tilted forward around the pivot 24 and the lock member 31 is pulled up, the lock means 27 is released and the height limiting means 28 is released at the same time. Hole 29,
By inserting / removing the lock member 31 into / from the swivel 30, the swivel base 18 becomes rotatable around the vertical axis 19 with respect to the support base 15, the push spring 36 enters the notch 38A, and the restricting member 3 moves.
3 is disengaged from the engaging portion 32 by the return spring 35, and the parallel link 11 can be raised.

The parallel link 11 is started up and the sheet 4 is moved to 1
Hole 2 facing lock hole 30 after turning 80 degrees
When the locking member 31 is inserted into the swivel base 9, the swivel base 18 is non-rotatably locked with respect to the support base 15, and the push spring 3
6 is pushed out from the back of the notch 38A to linearly move the restriction member 33 so as to face the return spring 35, and the engaging portion 3
2 to limit the upward movement of the parallel link 11 and return the seat 4 to the seatable state in that state, the backward posture B
Becomes

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 10 shows the whole of a tractor loader backhoe (TLB) in which a front loader 2 and a backhoe 3 are mounted on a tractor vehicle body 1, and a driver's seat 4 is used when the tractor runs on the road and when working on the front loader. The posture can be changed to a forward posture A, a rearward posture A used for backhoe work, and a rearward posture B used for backhoe work.

A transmission case 5 forms the rear part of the vehicle body 1. A rear axle case 6 is attached to the rear side of the transmission case, and a hydraulic device 7 for raising and lowering a working machine used when the backhoe is not used is attached to the upper part of the transmission case. Is installed. 1 to 9, the seat 4 is a seat reversing support device 1 having a parallel link 11 on a floor seat 8 covering a hydraulic device 7.
It is attached via 3. 14 is a fixed base, and there are a pair of front and rear parallel links 11, one end of each of which is a front and rear horizontal axis 22F,
It is pivotally connected via 2R, front and rear parallel links 11F, 1
A support base 15 is connected to each of the other ends of the 1R via front and rear support shafts 17F and 17R, and the rear parallel link 11R and the fixed base 14 are connected.
And are urged in the standing direction by a tension spring (urging means) 16 provided therebetween.

The front and rear parallel links 11F and 11R are each formed of two right and left sides, and the rear parallel link 11R has an arm 25 projecting downward.
The tension spring 16 is stretched between the second spring and the second floor. 1
Reference numeral 8 is a swivel base, and a vertical axis 19 is fixed to the center.
9 is rotatably supported by the support base 15, and the swivel base 18 is rotatably mounted on the support base 15.

A pair of left and right guide rails 20 are fixed on the swivel base 18, and the sliding plate 2 is attached to the left and right guide rails 20.
1 is provided so as to be slidable forward and backward, the front portion of the sliding plate 21 is pivotally connected to the front portion of the seat 4 via a pivot 24, and the rear portion of the sliding plate 21 receives the rear portion of the seat 4. Cushion 2
3 is provided. By rotating the seat 4 around the pivot 24, the swivel base 18 can be exposed.

Between the support base 15 and the swivel base 18,
Locking means 27 for positioning at a position rotated by 180 °
However, height limiting means 28 are provided between the support base 15 and the parallel links 11, respectively. The locking means 27 has two holes 29 formed in the swivel base 18 by being displaced by 180 °.
And one lock hole 30 formed in the support base 15 and a lock member 31 made of a pin inserted therethrough, and one of the holes 29 of the swivel base 18 is provided with the lock hole 30 of the support base 15. The lock member 31 is inserted from above the exposed swivel base 18 so that the swivel base 18 is fixed forward or backward, and the swivel base 18 can be swung freely by removing the lock member 31.

The height limiting means 28 is a front parallel link 11F.
Has a protrusion-like engaging portion 32 provided on the upper end of and a regulation member 33 that engages with the engagement portion 32 in a disengageable manner. The regulation member 33 is attached to the block 33A fitted to the front support shaft 17F. The L-shaped plate member 33B is fixedly formed in a front view.
3B has an upper end 33a slidably in contact with the lower surface of the support base 15 and is adapted to move linearly in the axial direction without rotating, and the horizontal part b causes the horizontal part b to engage.
Engage with 2. By engaging the horizontal portion 33b with the engaging portion 32, the upward rotation of the parallel link 11 above a certain level is regulated so as to be vertical. The height limiting means 28 functions both when the seat 4 is facing forward and when facing backward,
To prevent the rise of.

Interlocking means 34 is provided between the height limiting means 28 and the locking means 27. Interlocking means 34
Is a return spring 35 for urging the regulating member 33 in the direction of disengagement from the engaging portion 32, and a push spring 36 capable of urging the regulating member 33 in the direction of engaging the engaging portion 32 more strongly than the return spring 35. Have and. The return spring 35 is fitted on the front support shaft 17F, and the push spring 36 is mounted on the lower surface of the support base 15 and is a support body 3 having a vertical axis shape.
7, the one end of the push spring 36 is attached to the regulating member 3
3, the other end of which is fixed to the lower surface of the support base 15
It is locked in the notch 38 </ b> A of 8.

The support cylinder 38 is provided concentrically with the lock hole 30, and the lock member 31 can be inserted below the cutout 38A. When the lock member 31 is not inserted, the other end of the push spring 36 is inserted. Is a notch 38 of the support cylinder 38.
When the lock member 31 enters the support cylinder 38, the other end of the push spring 36 is pushed out from the depth of the notch 38A. Then, a compressive force is applied to the push spring 36, and the regulating member 33 is pushed toward the engaging portion 32 side to be engaged.

In the forward posture A shown by the solid lines in FIGS. 5 and 6, the regulating member 33 engages with the engaging portion 32 and the front and rear parallel links 11F and 11R are urged by the tension spring 16 in the rising direction. Of the lock member 3 by tilting the seat 4 forward around the pivot 24 from this state.
When 1 is pulled out, the restricting member 33 is disengaged from the engaging portion 32 and the front and rear parallel links 11F and 11R can stand up, and at the same time, the lock of the swivel base 18 with respect to the support base 15 is released, and the seat 4 is released. It becomes freely rotatable around the vertical axis 19.

Then, the seat 4 is moved around the vertical axis 19 by 1
When the lock member 31 is inserted through the holes 29, 30 and the support cylinder 38 after rotating the parallel links 11F, 11R by rotating 80 ° and tilting the parallel links 11F, 11R to the rear side, as shown by the two-dot chain line in FIGS.
The upward swing of the parallel link 11 in the backward posture B is restricted. When the parallel link 11 is tilted from the front side to the rear side, the arm 25 passes over the center lines of the front and rear horizontal shafts 22F and 22R, at which time the tension spring 16 is in the neutral state.

A receiving member 40 for supporting the seat 4 in the rearward posture B is provided on the upper rear portion of the fixed base 14. As shown in FIGS. 6, 8 and 9, the receiving member 40 is formed of a solid round bar, and bolts 41 with knobs that penetrate the rising wall 14A of the fixed base 14 are screwed into both ends of the receiving member 40. The hole through which the bolt 41 with a knob of 14A penetrates is an elongated hole 42 in the vertical direction.

Therefore, the receiving member 40 has a knob bolt 41.
The vertical position can be freely adjusted by loosening, and the bolt 4 with the knob can be fixed to the fixed base 14 by tightening the adjusted position, and the seat 4 can be fixed at the required height (lower limit position).
Can be set to. The present invention is not limited to the above embodiment, but can be variously modified. For example, the lock member 31 is provided so as to be inserted into the holes 29 and 30 from the lower side of the support cylinder 38 via the operation lever, and the holes 29 and 30 are provided.
A recess may be formed so that the push spring 36 can be inserted into the notch 38A in the state of being detached from the receiving member 40, and the receiving member 40 may be a round bar whose outer periphery is covered with a rubber material.

[0024]

According to the present invention described in detail above, one of the front and rear support shafts 17 is provided with the restricting member 33 that engages with the parallel link 11 by axial movement and restricts its upward rotation, and the swivel base 18 is provided. The lock member 31 and the restriction member 3 which are inserted into the support base 15 and set the swivel base 18 in the frontward and rearward positions.
3 and the lock member 31 is inserted into the restriction member 33.
Since the interlocking means 34 that engages with the parallel link 11 is provided, the posture of the seat 4 can be changed and the seat 4 can be prevented from rising at the same time by simply inserting and removing the lock member 31, and the structure is simple and the cost can be reduced.

Further, since a receiving member 40 for restricting the rearward rotation of the rear parallel link 11R beyond a certain level is provided at the rear portion of the fixed base 14 so that the vertical position can be adjusted, the height of the seat 4 in the rearward posture B. You can make adjustments.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the same portion.

3 is a cross-sectional view taken along line XX of FIG.

FIG. 4 is a sectional view taken along line YY of FIG.

FIG. 5 is a sectional side view of the same portion.

FIG. 6 is an overall side view.

FIG. 7 is a plan view of the whole with a part notched.

FIG. 8 is a sectional side view of height adjusting means.

FIG. 9 is a cross-sectional rear view of the height adjusting means.

FIG. 10 is an overall side view of the TLB.

[Explanation of symbols]

 1 tractor vehicle body 4 seat 11F front parallel link 11R rear parallel link 13 seat reversing support device 14 fixed base 15 support base 17 support shaft 18 swivel base 19 vertical axis 22 horizontal shaft 27 locking means 28 height limiting means 29 hole 30 lock hole 32 Engagement part 33 Regulation member 34 Interlocking means 40 Receiving tool A Forward posture B Rearward posture

Claims (2)

[Claims] 1. A pair of front and rear parallel links (11F) via a horizontal shaft (22) on a fixed base (14) fixed to the vehicle body (1) side.
Each end of (11R) is pivotally supported, and front and rear parallel links (11R)
F) (11R) is connected to a support base (15) via the support shaft (17) at each of the other ends, and the vertical axis (1
The swivel base (18) is rotatably mounted via the swivel base (9), and the seat (4) is mounted on the swivel base (18).
8) and a support base (15) are inserted into the lock member (31) for positioning the swivel base (18) in the forward and backward directions, and the parallel link (11) is provided between the fixed side and the parallel link (11). A reverse support device for a vehicle seat, comprising an urging means for urging the other end of 11) upward, which is engaged with a parallel link (11) by axial movement of one of the front and rear support shafts (17). The regulating member (33) for regulating the upward rotation of the lever is provided, and the regulating member (33) is inserted between the locking member (31) and the regulating member (33) so that the regulating member (33) is parallel-linked (11). An inversion support device for a vehicle seat, characterized in that an interlocking means (34) for engaging with the vehicle seat is provided. 2. A receiving member (40) for restricting a rearward rotation of the rear parallel link (11R) beyond a certain level is provided at the rear portion of the fixed base (14) so as to be adjustable in vertical position. The inversion support device for a vehicle seat according to claim 1.